Good evening. Re the rework to the sail pulley on Karoline. I had to dismantle the pulley system to reroute the cabling, so took some photos to compare the before and after. Here are the photos that show the modifications that changed the pulley pull from 477mm to 250mm, by altering the diameter of the drum from 39mm to 20 mm. This therefore enabled the full 4 rotations of the servo to coincide with the full top to bottom of the joystick on the transmitter, this was because the % of the servo travel cannot be altered on my futaba transmitter. It now works on the bench just right, we will see tomorrow at the pond!. Photos show the new pulley on the left, and the original on the right in all photos
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Good evening. Re the rework to the sail pulley on Karoline. I had to dismantle the pulley system to reroute the cabling, so took some photos to compare the before and after. Here are the photos that show the modifications that changed the pulley pull from 477mm to 250mm, by altering the diameter of the drum from 39mm to 20 mm. This therefore enabled the full 4 rotations of the servo to coincide with the full top to bottom of the joystick on the transmitter, this was because the % of the servo travel cannot be altered on my futaba transmitter. It now works on the bench just right, we will see tomorrow at the pond!. Photos show the new pulley on the left, and the original on the right in all photos
Hi again, On my Electron the designer set up one servo with an equal length arm about 100 mm from centre to ends and put a small wheel from which a line goes to the boom (main) with the other end of arm having the same, which operate the headsail. With these individual wheels one can reduce or increase the length of the halyard, so to speak and this is where the one servo operates both sails. He was very clever with his design. His name was Des Townsend and he designed very classic full size cruising yachts and smaller yachts with many of then in the Auckland harbour and probably other places around New Zealand. If I was home (I am currently spending 3 weeks in Fiji) I would take a photo of the set up and post it. Let me know if you are interested, or anybody else for that matter, and add to a clip when I get back early December. Cheers Ian
Hi again, On my Electron the designer set up one servo with an equal length arm about 100 mm from centre to ends and put a small wheel from which a line goes to the boom (main) with the other end of arm having the same, which operate the headsail. With these individual wheels one can reduce or increase the length of the halyard, so to speak and this is where the one servo operates both sails. He was very clever with his design. His name was Des Townsend and he designed very classic full size cruising yachts and smaller yachts with many of then in the Auckland harbour and probably other places around New Zealand. If I was home (I am currently spending 3 weeks in Fiji) I would take a photo of the set up and post it. Let me know if you are interested, or anybody else for that matter, and add to a clip when I get back early December. Cheers Ian
Hi Rogal, I think the description of the work you did is very interesting and very useful for everyone.
I therefore hope that you will share many photos (perhaps accompanied by captions) that visually show the commendable work you have done.
Hi Rogal, I think the description of the work you did is very interesting and very useful for everyone.
I therefore hope that you will share many photos (perhaps accompanied by captions) that visually show the commendable work you have done.
Thanks guys for your interest and all your comments, I really appreciate it. A little more info, as I have not wrote a blog yet about this refurb.The radio operates the rudder and the servo pulley, plus the forward reverse for the twin 30mm props. The rudder has been enlarged by about 25% which does make a big difference from standard. When I originally acquired the Karoline the servo pulley rotated a full 4 turns which gave a cord pull of 477mm which was far too much,I only required 250mm. My transmitter does not have the facility to limit the % of turns so I needed to fit a smaller diameter pulley. So I decided too make one. I started calculating the size required.250 total pull divided x 4turns = 62.5 for one turn, which would be the circumference of the new pulley. Divide this by pi 3.142 =19.89mm. I had a piece of 20mm pipe so this was near enough. I cut 3 larger 40mm discs from 1.5 mm plastic and cut 2 pipe discs at 3mm long. I drilled a 1mm hole in each pipe and sandwiched the parts alternately to form a 2 drum pulley, gluing together with supa glue, making sure the 2 x 1mm holes were inline with each other. i then glued a 4 arm servo bracket to the bottom 40 mm disc so I could screw to the servo output shaft. I then threaded the pulley cord through the 2 holes to form a continuous loop to push pull the mainsail boom. This is the only sail operated by the cord pulley. With it being a 2 drum pulley the cord can now wind and unwind the loop without getting tangled up.
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Thanks guys for your interest and all your comments, I really appreciate it. A little more info, as I have not wrote a blog yet about this refurb.The radio operates the rudder and the servo pulley, plus the forward reverse for the twin 30mm props. The rudder has been enlarged by about 25% which does make a big difference from standard. When I originally acquired the Karoline the servo pulley rotated a full 4 turns which gave a cord pull of 477mm which was far too much,I only required 250mm. My transmitter does not have the facility to limit the % of turns so I needed to fit a smaller diameter pulley. So I decided too make one. I started calculating the size required.250 total pull divided x 4turns = 62.5 for one turn, which would be the circumference of the new pulley. Divide this by pi 3.142 =19.89mm. I had a piece of 20mm pipe so this was near enough. I cut 3 larger 40mm discs from 1.5 mm plastic and cut 2 pipe discs at 3mm long. I drilled a 1mm hole in each pipe and sandwiched the parts alternately to form a 2 drum pulley, gluing together with supa glue, making sure the 2 x 1mm holes were inline with each other. i then glued a 4 arm servo bracket to the bottom 40 mm disc so I could screw to the servo output shaft. I then threaded the pulley cord through the 2 holes to form a continuous loop to push pull the mainsail boom. This is the only sail operated by the cord pulley. With it being a 2 drum pulley the cord can now wind and unwind the loop without getting tangled up.
Rogal 118
you must have had the time of your life!!!!!!
What else can a man wish on a sunday?!?
The colour of your sails is just perfect.
congratulations 👍👍👍
Rogal 118
you must have had the time of your life!!!!!!
What else can a man wish on a sunday?!?
The colour of your sails is just perfect.
congratulations 👍👍👍
Sunday at the pond. After a stormy morning, by the time I got to the pond the rain had stopped, the temp was mild with a gentle breeze. Just perfect for sailing the Karoline at last. So I put her through her paces and the gentle breeze was just right, although as normal for Balne moor it swirls around the surface with it being inset into the landscape. But she sailed well and at one point was tipped over by a gust of wind, enough to wet the mainsail halfway up. But instantly she righted herself, proving that the false lead keel was the correct weight and tightening the hatch fit proved a good move as they held in situ. If this would have been left as the kit the hatches would have floated off and the hull would have filled with water, titanic style. So my fears were founded and the modifications proving correct.
https://youtu.be/NswOhlDUqtw?si=ro3jHKUDfvcPdNGU
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Sunday at the pond. After a stormy morning, by the time I got to the pond the rain had stopped, the temp was mild with a gentle breeze. Just perfect for sailing the Karoline at last. So I put her through her paces and the gentle breeze was just right, although as normal for Balne moor it swirls around the surface with it being inset into the landscape. But she sailed well and at one point was tipped over by a gust of wind, enough to wet the mainsail halfway up. But instantly she righted herself, proving that the false lead keel was the correct weight and tightening the hatch fit proved a good move as they held in situ. If this would have been left as the kit the hatches would have floated off and the hull would have filled with water, titanic style. So my fears were founded and the modifications proving correct.
